首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   4559篇
  免费   275篇
  国内免费   20篇
耳鼻咽喉   23篇
儿科学   81篇
妇产科学   55篇
基础医学   433篇
口腔科学   227篇
临床医学   439篇
内科学   1746篇
皮肤病学   30篇
神经病学   198篇
特种医学   211篇
外科学   478篇
综合类   93篇
一般理论   2篇
预防医学   393篇
眼科学   116篇
药学   185篇
中国医学   2篇
肿瘤学   142篇
  2023年   22篇
  2022年   19篇
  2021年   86篇
  2020年   32篇
  2019年   72篇
  2018年   120篇
  2017年   57篇
  2016年   69篇
  2015年   90篇
  2014年   148篇
  2013年   198篇
  2012年   298篇
  2011年   309篇
  2010年   219篇
  2009年   171篇
  2008年   268篇
  2007年   313篇
  2006年   251篇
  2005年   259篇
  2004年   243篇
  2003年   227篇
  2002年   197篇
  2001年   66篇
  2000年   59篇
  1999年   57篇
  1998年   73篇
  1997年   55篇
  1996年   38篇
  1995年   26篇
  1994年   43篇
  1993年   50篇
  1992年   45篇
  1991年   42篇
  1990年   39篇
  1989年   38篇
  1988年   48篇
  1987年   35篇
  1986年   38篇
  1985年   34篇
  1984年   30篇
  1983年   23篇
  1982年   31篇
  1981年   24篇
  1980年   27篇
  1978年   22篇
  1977年   22篇
  1976年   20篇
  1973年   19篇
  1969年   18篇
  1968年   18篇
排序方式: 共有4854条查询结果,搜索用时 31 毫秒
41.
42.
43.
Anomalous right coronary artery from the pulmonary artery (ARCAPA) is a rare congenital coronary anomaly that has an incidence of 0.002%. We report a case of a previously healthy female who presented to our hospital with pneumonia and was incidentally discovered to have ARCAPA. This was initially diagnosed on echocardiography by the unusual echocardiographic finding of multiple color flow Doppler signals around the right ventricular free wall and apex which were subsequently confirmed by angiography to be due to extensive collateral circulation between the left and right coronary arteries. This represents an unusual echocardiographic manifestation of this very rare condition.  相似文献   
44.
Coronary artery disease (CAD) is a major cause of morbidity and mortality in patients ≥80 years of age. Nonetheless, older patients have typically been under-represented in cardiovascular clinical trials. Understanding the pathophysiology, epidemiology, and optimal means of diagnosis and treatment of CAD in older adults is crucial to improving outcomes in this high-risk population. A patient-centered approach, taking into account health status, functional ability and frailty, cognitive skills, and patient preferences is essential when caring for older adults with CAD. The present systematic review focuses on the current knowledge base, gaps in understanding, and directions for future investigation pertaining to CAD in patients ≥80 years of age.  相似文献   
45.
Labial adhesions are usually seen in early childhood or in the postmenopausal years, but this clinical entity is rarely seen in the reproductive years. We report a case of labial adhesion with acute urinary retention secondary to Bartholin's abscess in a reproductive‐aged woman with normal menstrual periods. We emphasize the possible occurrence of labial adhesion following Bartholin's abscess in the reproductive years with normal estrogen levels.  相似文献   
46.
47.
This assessment provides the most recent estimates of overweight and obesity among children 4 to 5 years old who were enrolled in public schools in the 2007–2008 school year, using data obtained from Student Health Records for 12,823 children, which represents 91% of the 14,070 children who were enrolled in kindergarten in 2007–2008. This assessment is a census of 4 to 5 year olds that entered public schools in Hawai‘i in 2007–2008 and represents approximately 38% of the total Hawai‘i population for those aged 4 to 5 years, since kindergarten is not a requirement. A limited data set with data on age, sex, height, and weight was used to calculate BMI (body mass index) percentiles. We compare this data with age and sex-specific BMI obtained from Student Health Records from 10,199 children aged 4 to 5 years entering public schools during 2002–2003. The results illustrate that like the 2002–2003 data (28.5%), over one in four (28.6%) of the children aged 4 to 5 years entering Hawai‘i public schools in 2007–2008 were either overweight or obese. Total proportions overweight and obese were persistently higher (32.5% or more in both 2002–2003 and 2007–2008) in some specific school complexes on O‘ahu as well as in some rural and Neighbor Island school complexes. Physicians, public health and school health professionals, advocates, schools, and communities should be vigilant about this persistent problem and seek to implement practices to combat overweight and obesity. In addition, the use of Student Health Records for on-going pediatric obesity surveillance should be explored more fully.  相似文献   
48.
49.
BackgroundHeart failure (HF) patients exhibit depression and executive function impairments that contribute to HF mortality. Using specialized magnetic resonance imaging (MRI) analysis procedures, brain changes appear in areas regulating these functions (mammillary bodies, hippocampi, and frontal cortex). However, specialized MRI procedures are not part of standard clinical assessment for HF (which is usually a visual evaluation), and it is unclear whether visual MRI examination can detect changes in these structures.Methods and ResultsUsing brain MRI, we visually examined the mammillary bodies and frontal cortex for global and hippocampi for global and regional tissue changes in 17 HF and 50 control subjects. Significantly global changes emerged in the right mammillary body (HF 1.18 ± 1.13 vs control 0.52 ± 0.74; P = .024), right hippocampus (HF 1.53 ± 0.94 vs control 0.80 ± 0.86; P = .005), and left frontal cortex (HF 1.76 ± 1.03 vs control 1.24 ± 0.77; P = .034). Comparison of the visual method with specialized MRI techniques corroborates right hippocampal and left frontal cortical, but not mammillary body, tissue changes.ConclusionsVisual examination of brain MRI can detect damage in HF in areas regulating depression and executive function, including the right hippocampus and left frontal cortex. Visual MRI assessment in HF may facilitate evaluation of injury to these structures and the assessment of the impact of potential treatments for this damage.  相似文献   
50.
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号